Just book it.
Pros: 2 bedrooms, nice living area and kitchen. Nothing fancy but well kept and modern. Great location. Walk 5 mins to nana rail station. But also very convenient to get anywhere else in the city. Washing machine and air conditioning work great. There's a 24 hour security guard downstairs. Usually more than one guy. They are also there to help if you need any help inside your room. Very quiet tenants, didnt realize other people also lived in the building.
Also, the host went above and beyond. Gave very easy check in process. Just meet the guards out front and give them a code. No worries about bringing friends over, which is a plus. Also, he responded to all my questions within minutes. I requested a late check out and he dealt with it very professionally and it couldn't have been easier.
Cons: construction noise near the building was annoying but it wouldn't stop me from booking here again.
Overall: if you're looking for a nice clean place near all the action, this is a great choice. If you need something quieter, central bangkok might not be the location you want to book.